<!DOCTYPE html>
<html>
<div style="display:block; width:100px; height:100px; background: blue;"></div>
<div style="display:block; width:100px; height:100px; background: green;"></div>
<div style="display:block; width:100px; height:100px; background: blue;"></div>
<div style="display:block; width:100px; height:100px; background: purple;"></div>
</html>
